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6 5 7 Procedure 7 1 7 2 Pretreatment 7 1 1 For drmkmg waters, surface waters, salIne waters, and dIlutIons thereof, no pretreatmentstepsarenecessary Proceedto72 7 1 2 For most wastewaters, and hIghly polluted waters, the sample must be dIgested as gIven m the AtomIC AbsorptIOn Methods sectIon of thIS manual, paragraphs 4 1 3 and 4 1 4 Followmg thIS dIgestIOn, proceed to 7 2 TItratIOn of sample-normal to hIgh hardness 73 7 4 721 7 2 2 Sample should reqUire <15 ml EDTA tItrant (64) and tItratIon should be completed wlthm 5 mmutes ofbuffer addItIon Place 2 5 0 m 1 sample m tItratIon vessels, neutralIze WIth 1N ammOlllum hydrOXIde (6 5) and dIlute to about 50 ml few drops at 3-5 second mtervals At end pomt the color IS blue Total tItratIon duratIon should be 5 mmutes from the tIme ofbuffer addItIOn N of EDTA 02 ml of EDTA Ammolllum HydroxIde, IN DIlute 70 ml ofconc NH40H to 1 lIter wIth dIstIlled water 723 7 2 4 If end pomt IS not sharp (as determmed by practIce run) add mhlbltor at thIS pomt (see 74) 725 Add1to2dropsmdlcatorsolutIOn(631or632)orsmallscoopofdnedpowder mdlcator formulatIOn (6 3 3) 7 2 6 TItrate slowly WIth contmuous strrnng WIth standard EDT A tItrant (6 4) untIl last reddIshtmtdIsappears SolutIOnISnormallyblueatendpomt TItratIOn ofsample-low hardness (less than 5 mg/l) 731 Usealargersample(lOOml) 7 3 2 Use proportIonately larger amounts ofbuffer, mhibitor and mdlcator 7 3 3 Use a microburet and run a blank usmg redIstilled, dIstIlled or deIolllzed water T o correct for mterferences 7 4 1 Some metal Ions mterfere by causmg fadmg or mdIstmct end pomts InhIbItors reduce thIS m accord WIth the scheme below for 250 ml samples dIluted to 50 ml Add 1to 2 ml buffer solutIOn (6 1) 1302-3PDF Image | Methods for Chemical Analysis of Water and Wastes
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